| 摘要 |
Optical keyboard with matrix scanning comprising a logic matrix of inputs (3) and outputs (2) of light consisting of optical paths with keys arranged on each optical path connecting the inputs and the outputs so that the depression of one of the keys produces a change detected by the pilot scanning circuit connected to said light inputs and outputs to record these modifications affecting each couple of inputs (3)/outputs (2), by injecting periodically an interrogation signal in turn into each input and by scanning for the presence of optional modifications in the signal on each output. Said keyboard is characterized in that it comprises means (1, 4, 5), for a given emission level, capable of enhancing the sensitivity to light reaching said outputs of the pilot circuit. |
